The Prestige Precept Center (Japanese: トレーナーズトレーニングセンターTrainers' Training Center), known better as the Pre Gym, is a "Gym" led by Justy. It is the central part of Phenac City. Unlike other Gyms, this Gym does not give out a Badge, and therefore cannot be considered an official Gym. Instead, the prize for beating this Gym is TM27 (Return) and access to its lower level.

Justy himself is usually seated at a control panel on the right side of the Gym, watching over the battlefield. He will refuse to battle with Trainers who do not have a full party, but his Junior Trainers can be battled for a White Herb. In Pokémon XD, he will send an email to Michael's P★DA to inform him when he is ready to battle.

This Gym also contains a classroom, making it double as an academy. In Pokémon Colosseum, the teacher in this classroom gives the player's P★DA the Strategy Memo feature and updates it with new information on encountered Pokémon. Since the Strategy Memo is Pokémon Colosseum's equivalent of the Pokédex, learning more about any Pokémon in Colosseum requires revisiting Pre Gym at many points during the game.

The basement can only be accessed by the elevator at the far end of the Gym's battlefield. In Pokémon Colosseum, using this elevator requires first defeating Justy. In Pokémon XD: Gale of Darkness, it requires defeating Snattle, who locked the citizens of Phenac City in the lower level and holds the elevator's key, replacing them all with members of the evil organization Cipher. The basement of the Pre Gym has four areas, each representing a different type of terrain. Pre Gym Trainers can often be found there, training their Pokémon.

Pokémon XD

During Cipher's invasion

When Michael visits Pre Gym for the first time, his warning to Justy about Cipher's return falls on deaf ears. The teachers are also holding very unorthodox lessons, telling the students of the Gym that Pokémon are merely tools for battle. The hero soon learns that Cipher has already taken hold of the city, and goes back to the Gym to confront the fake Justy.